RT Book, Section A1 Hardin, J. Matthew A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181044103 T1 Onychomycosis T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1181044103 RD 2024/03/29 AB Onychomycosis is an invasion of the nails by any fungus. Four clinical subtypes are described. Distal subungual presents as discolorations of the free edge of the nail with hyperkeratosis, leading to subungual accumulation of friable keratinaceous debris. White superficial consists of sharply outlined white areas on the nail plate, which leave the surface friable. Proximal subungual presents as discolorations that start proximally at the nail fold. Candidal onychomycosis encompasses the entire nail plate, leaving the surface rough and friable.